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Segment Information Summary of Net Operating Income (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | $ 150,406 us-gaap_RealEstateRevenueNet |  | $ 152,114 us-gaap_RealEstateRevenueNet |
Operating expenses | (60,698)us-gaap_CostOfGoodsAndServicesSold |  | (61,974)us-gaap_CostOfGoodsAndServicesSold | [1]
Net operating income | 89,708 us-gaap_GrossProfit |  | 90,140 us-gaap_GrossProfit |
Philadelphia CBD [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 52,973 us-gaap_RealEstateRevenueNet / us-gaap_StatementBusinessSegmentsAxis = bdn_PhiladelphiaCbdMember |  | 49,414 us-gaap_RealEstateRevenueNet / us-gaap_StatementBusinessSegmentsAxis = bdn_PhiladelphiaCbdMember |
Operating expenses | (18,390)us-gaap_CostOfGoodsAndServicesSold / us-gaap_StatementBusinessSegmentsAxis = bdn_PhiladelphiaCbdMember |  | (18,443)us-gaap_CostOfGoodsAndServicesSold / us-gaap_StatementBusinessSegmentsAxis = bdn_PhiladelphiaCbdMember | [1]
Net operating income | 34,583 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = bdn_PhiladelphiaCbdMember |  | 30,971 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = bdn_PhiladelphiaCbdMember |
Pennsylvania [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 39,890 us-gaap_RealEstateRevenueNet / us-gaap_StatementBusinessSegmentsAxis = bdn_PennsylvaniaMember |  | 40,574 us-gaap_RealEstateRevenueNet / us-gaap_StatementBusinessSegmentsAxis = bdn_PennsylvaniaMember |
Operating expenses | (14,585)us-gaap_CostOfGoodsAndServicesSold / us-gaap_StatementBusinessSegmentsAxis = bdn_PennsylvaniaMember |  | (14,687)us-gaap_CostOfGoodsAndServicesSold / us-gaap_StatementBusinessSegmentsAxis = bdn_PennsylvaniaMember | [1]
Net operating income | 25,305 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = bdn_PennsylvaniaMember |  | 25,887 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = bdn_PennsylvaniaMember |
Metropolitan Dc [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 27,406 us-gaap_RealEstateRevenueNet / us-gaap_StatementBusinessSegmentsAxis = bdn_MetropolitanDcMember |  | 30,690 us-gaap_RealEstateRevenueNet / us-gaap_StatementBusinessSegmentsAxis = bdn_MetropolitanDcMember |
Operating expenses | (11,860)us-gaap_CostOfGoodsAndServicesSold / us-gaap_StatementBusinessSegmentsAxis = bdn_MetropolitanDcMember |  | (11,957)us-gaap_CostOfGoodsAndServicesSold / us-gaap_StatementBusinessSegmentsAxis = bdn_MetropolitanDcMember | [1]
Net operating income | 15,546 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = bdn_MetropolitanDcMember |  | 18,733 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = bdn_MetropolitanDcMember |
New Jersey/ Delaware [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 13,500 us-gaap_RealEstateRevenueNet / us-gaap_StatementBusinessSegmentsAxis = bdn_NewJerseyDelawareMember |  | 15,625 us-gaap_RealEstateRevenueNet / us-gaap_StatementBusinessSegmentsAxis = bdn_NewJerseyDelawareMember |
Operating expenses | (7,868)us-gaap_CostOfGoodsAndServicesSold / us-gaap_StatementBusinessSegmentsAxis = bdn_NewJerseyDelawareMember |  | (8,692)us-gaap_CostOfGoodsAndServicesSold / us-gaap_StatementBusinessSegmentsAxis = bdn_NewJerseyDelawareMember | [1]
Net operating income | 5,632 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = bdn_NewJerseyDelawareMember |  | 6,933 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = bdn_NewJerseyDelawareMember |
Richmond, Virginia [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 9,296 us-gaap_RealEstateRevenueNet / us-gaap_StatementBusinessSegmentsAxis = bdn_RichmondVirginiaMember |  | 8,867 us-gaap_RealEstateRevenueNet / us-gaap_StatementBusinessSegmentsAxis = bdn_RichmondVirginiaMember |
Operating expenses | (4,272)us-gaap_CostOfGoodsAndServicesSold / us-gaap_StatementBusinessSegmentsAxis = bdn_RichmondVirginiaMember |  | (4,340)us-gaap_CostOfGoodsAndServicesSold / us-gaap_StatementBusinessSegmentsAxis = bdn_RichmondVirginiaMember | [1]
Net operating income | 5,024 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = bdn_RichmondVirginiaMember |  | 4,527 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = bdn_RichmondVirginiaMember |
CALIFORNIA |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 4,985 us-gaap_RealEstateRevenueNet / us-gaap_StatementBusinessSegmentsAxis = stpr_CA |  | 4,602 us-gaap_RealEstateRevenueNet / us-gaap_StatementBusinessSegmentsAxis = stpr_CA |
Operating expenses | (2,438)us-gaap_CostOfGoodsAndServicesSold / us-gaap_StatementBusinessSegmentsAxis = stpr_CA |  | (2,409)us-gaap_CostOfGoodsAndServicesSold / us-gaap_StatementBusinessSegmentsAxis = stpr_CA | [1]
Net operating income | 2,547 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = stpr_CA |  | 2,193 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = stpr_CA |
Austin, Texas [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 934 us-gaap_RealEstateRevenueNet / us-gaap_StatementBusinessSegmentsAxis = bdn_AustinTexasMember | [2] | 2,081 us-gaap_RealEstateRevenueNet / us-gaap_StatementBusinessSegmentsAxis = bdn_AustinTexasMember | [2]
Operating expenses | (870)us-gaap_CostOfGoodsAndServicesSold / us-gaap_StatementBusinessSegmentsAxis = bdn_AustinTexasMember | [2] | (1,176)us-gaap_CostOfGoodsAndServicesSold / us-gaap_StatementBusinessSegmentsAxis = bdn_AustinTexasMember | [1],[2]
Net operating income | 64 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = bdn_AustinTexasMember | [2] | 905 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = bdn_AustinTexasMember | [2]
Corporate Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 1,422 us-gaap_RealEstateRevenueNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember |  | 261 us-gaap_RealEstateRevenueNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember |
Operating expenses | (415)us-gaap_CostOfGoodsAndServicesSold / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember |  | (270)us-gaap_CostOfGoodsAndServicesSold / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | [1]
Net operating income | $ 1,007 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember |  | $ (9)us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember |
[1] | Includes property operating expense, real estate taxes and third party management expense.
[2] | On April 3, 2014, the Company contributed Four Points Centre to an unconsolidated real estate venture. Following the contribution of this property, there are no wholly owned properties in the Austin, Texas segment. Activity subsequent to the contribution is related to management fees and related expenses provided by the Company to the Austin Venture.

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- Definition The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 2 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(a),(d)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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